how to get socket.io number of clients in room?

Question

my socket.io version 1.3.5

I want to get number of clients in particular room.

This is my code.

 socket.on('create or join', function (numClients, room) {
            socket.join(room);
    });

I use this code for get clients in room :

console.log('Number of clients',io.sockets.clients(room));

Answer 1

This works for version 3

io.sockets.adapter.rooms.get(roomName).size

Answer 2

To get the number of clients in a room you can do the following:

    function NumClientsInRoom(namespace, room) {
      var clients = io.nsps[namespace].adapter.rooms[room];
      return Object.keys(clients).length;
    }

This variable clients will hold a object where each client is a key. Then you just get the number of clients (keys) in that object.

If you haven't defined a namespace the default one is "/".